Just got a Dreamline Bullpup and was noticing that the shroud will twang off the air cylinder pretty easy. Has anyone else noticed this? Really other than that love it.
SOLD FX Dreamline Bullpup
- Thread starter mystryak
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Make sure all barrel set screws are nice and snug, and barrel sleeve / liner also. She’ll be fine.
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mystrak
Does yours do it?
Yes, if I knock it on something, but it springs back into position, with no accuracy issues. All 4 of my FX’s do this. Characteristic of a free floating barrel. They’re, well at least my guns barrels aren’t necessarily lose or anything. They just sort of spring like a super stiff diving board and quickly return back to where they should be. “Free-Float” I used to be worried about this, but after about 3 years a lot of shooting 4 FX guns later. I don’t think about it. Also believe it’s because the air cylinder is only millimeters away from the air cylinder, if FX air cylinder rifle barrels’ were about a inch away from the cylinder by design this would never happen. Admittedly, yeah it’s annoying, but affects nothing.
Does yours do it?
Yes, if I knock it on something, but it springs back into position, with no accuracy issues. All 4 of my FX’s do this. Characteristic of a free floating barrel. They’re, well at least my guns barrels aren’t necessarily lose or anything. They just sort of spring like a super stiff diving board and quickly return back to where they should be. “Free-Float” I used to be worried about this, but after about 3 years a lot of shooting 4 FX guns later. I don’t think about it. Also believe it’s because the air cylinder is only millimeters away from the air cylinder, if FX air cylinder rifle barrels’ were about a inch away from the cylinder by design this would never happen. Admittedly, yeah it’s annoying, but affects nothing.
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is there a barrel band to prevent that from happening?or would a barrel band take away from how good they shoot?i looking to get an FX Dreamline in 25 cal but I only hunt with my rifles and I not want to worry about hitting something in the woods and missing a shot.
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I was really interested in the Dreamline Bullpup, but the Scope Rail design concerns me, I would have liked it better if it had more than one attachment point. Thoughts?
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Do you have a moderator on the end of your barrel?
I was quite surprised to hear that this is a "common" issue on FX guns because I've quite honestly never seen this on my Crown. There is only a little clearance between bottle and shroud, but the two have never met. The only thing I could think of is maybe if you hang enough mass at the end of your barrel a good jolt will cause the barrel to hit the tube? Am I crazy?
I realize barrel bands are fairly common in the airgun industry, however you seem to see them a lot less often on the "high precision" airguns because a freely floated barrel will be more accurate than a banded one. Compound that with the fact that the pressure tube will likely change dimensions ever so slightly as it gains/loses pressure and you probably want your barrel to be separate from your air supply.
Of course this is just what I'm told, I confess I haven't actually measured it, but it makes sense. If you're trying to do one-hole groups at 50 yards, a POI shift of 1/3rd inch across your shot string would be a problem, and that is just two tenths of a miliradian or .011 degrees. TINY shifts here. I'm going to go based off my FX crown just because it is what I have on hand to measure, but a little trigonometry says that if my tank were banded to my barrel and it swelled just .04 of a millimeter (that is one and a half thousandths of an inch, or about half the thickness of a human hair) it'd cause that much POI shift. Not to mention the changes in harmonics it could cause.
I hope that sheds a little light on why many manufacturers may avoid barrel bands and instead move toward free floated barrels or barrels clamped by scope rails.
It is a pretty simple piece of equipment though, particularly on tube guns, I could easily make you one if you wanted to give it a go. You'd have to just supply accurate dimensions.
But again, what do I know? I'm just some guy with a keyboard.
I was quite surprised to hear that this is a "common" issue on FX guns because I've quite honestly never seen this on my Crown. There is only a little clearance between bottle and shroud, but the two have never met. The only thing I could think of is maybe if you hang enough mass at the end of your barrel a good jolt will cause the barrel to hit the tube? Am I crazy?
I realize barrel bands are fairly common in the airgun industry, however you seem to see them a lot less often on the "high precision" airguns because a freely floated barrel will be more accurate than a banded one. Compound that with the fact that the pressure tube will likely change dimensions ever so slightly as it gains/loses pressure and you probably want your barrel to be separate from your air supply.
Of course this is just what I'm told, I confess I haven't actually measured it, but it makes sense. If you're trying to do one-hole groups at 50 yards, a POI shift of 1/3rd inch across your shot string would be a problem, and that is just two tenths of a miliradian or .011 degrees. TINY shifts here. I'm going to go based off my FX crown just because it is what I have on hand to measure, but a little trigonometry says that if my tank were banded to my barrel and it swelled just .04 of a millimeter (that is one and a half thousandths of an inch, or about half the thickness of a human hair) it'd cause that much POI shift. Not to mention the changes in harmonics it could cause.
I hope that sheds a little light on why many manufacturers may avoid barrel bands and instead move toward free floated barrels or barrels clamped by scope rails.
It is a pretty simple piece of equipment though, particularly on tube guns, I could easily make you one if you wanted to give it a go. You'd have to just supply accurate dimensions. But again, what do I know? I'm just some guy with a keyboard.
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Tight screws, doesn’t move. Pellet on pellet day after day one month straight, in and out of case. Seriously, don’t be concerned. I was concerned but now I’m not. I’d say it in front of a judge. Truth...
75 yards on a Crow yesterday... Dead... 1 shot and windy. Dang I wish I took pictures.
75 yards on a Crow yesterday... Dead... 1 shot and windy. Dang I wish I took pictures.
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Boy, does that scope hang out there in never-never land.
The crossbow guys would have a heart attach with half that over hang..! They don't realize that IF...the scope does move, the arrow is already gone..!
Mike
The crossbow guys would have a heart attach with half that over hang..! They don't realize that IF...the scope does move, the arrow is already gone..!
Mike
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